Abstract:It is of practical value to determine the hydraulic conductivity tensors of large-scale dynamo-relaxed rock masses at site of Daliushu dam on the Yellow River and to analyze the seepage field. The dominant sets of joints or fractures and their distribution parameters in rock masses of abutments and foundation are obtained by statistics from many prospecting tunnels. Then the hydraulic conductivity tensors are calculated by means of seepage theory through equivalent continuum,and modified by the data of consolidation grouting test,including water pressure test result in the left abutment and the data of seepage discharge measured in the prospecting tunnel under the river. The analyses of seepage through three main sections are also carried out. It can be concluded that the rock mass at site of the dam has great permeability with the magnitude of 10-5~10-4m/s,and that the quantities of seepage discharge and curtain grouting engineering should be large enough.